2021166 has 32 divisors (see below), whose sum is σ = 5134080. Its totient is φ = 577368.

The previous prime is 2021143. The next prime is 2021167. The reversal of 2021166 is 6611202.

It is a happy number.

It is a super-2 number, since 2×2021166² = 8170223999112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2296 + ... + 3051.

It is an arithmetic number, because the mean of its divisors is an integer number (160440).

2^2021166 is an apocalyptic number.

2021166 is an abundant number, since it is smaller than the sum of its proper divisors (3112914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021166 is a wasteful number, since it uses less digits than its factorization.

2021166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365 (or 5359 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2021166 is about 1421.6771785465. The cubic root of 2021166 is about 126.4350043922.

Adding to 2021166 its reverse (6611202), we get a palindrome (8632368).

It can be divided in two parts, 2021 and 166, that added together give a 7-th power (2187 = 3⁷).

The spelling of 2021166 in words is "two million, twenty-one thousand, one hundred sixty-six".